Rear Admiral John A. Dahlgren.
Served with Coast Survey in 1830's.
Only naval officer to ever head triangulation party
Remained a lifelong friend of Ferdinand Hassler
Image ID: theb3426, NOAA's People Collection
Photo Date: 1864?
Category: Personnel/Single Portrait/John A. Dahlgren/
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of the U.S. Department of Commerce, National Oceanic & Atmospheric
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